基于充分性和安全性的电力系统运行状态分析和量化评价

ANALYSIS OF POWER SYSTEM OPERATION STATE BASED ON ADEQUACYAND SECURITY

对于包括发电系统和输电系统在内的组合电力系统,传统的概率可靠性评估方法虽可计算各种停电指标,但不能反映系统的相对安全水平和安全裕度。该文在电力系统的静态和动态安全性能综合评估算法的基础上,分析了系统各种运行状态的原因、后果及持续时间,在对现有电力系统运行状态划分方法进行分析比较后,提出了新的系统状态定义框架、状态分析的数学模型及状态风险指标定义。文中所定义的系统状态兼顾了电力系统的静态和动态性能、故障原因和故障后果,可分别计算出各计算模块相应的状态指标,为分析和找出制约系统安全性和可靠性的主要因素奠定了基础。

Existing probabilistic evaluation for composite power system gives reliability indices based on load curtailment. These indices can’t reflect the level or degree of security. An integrated evaluation method considering adequacy and security is adopted in the paper to analyze the cause and result of different operating states. The paper constructs a feasible framework of state definition based on load curtailment and system behavior. State criterion is made according to load importance and accepted security. The quantitative indices of probabilistic state evaluation give a vivid description of security and are valuable to system operator.